# Package org.apache.tinkerpop.gremlin.process.computer

- Interface Summary
  Interface | Description
  --- | ---
  ComputerResult | The result of the `GraphComputer`'s computation.
  GraphComputer | The `GraphComputer` is responsible for the execution of a `VertexProgram` and then a set of `MapReduce` jobs over the vertices in the `Graph`.
  GraphComputer.Features |
  MapReduce<MK,MV,RK,RV,R> | A MapReduce is composed of map(), combine(), and reduce() stages.
  MapReduce.MapEmitter<K,V> | The MapEmitter is used to emit key/value pairs from the map() stage of the MapReduce job.
  MapReduce.ReduceEmitter<OK,OV> | The ReduceEmitter is used to emit key/value pairs from the combine() and reduce() stages of the MapReduce job.
  Memory | The Memory of a `GraphComputer` is a global data structure where by vertices can communicate information with one another.
  Memory.Admin | The Admin interface is used by the `GraphComputer` to update the Memory.
  MessageCombiner<M> | A MessageCombiner allows two messages in route to the same vertex to be aggregated into a single message.
  Messenger<M> | The `Messenger` serves as the routing system for messages between vertices.
  VertexProgram<M> | A `VertexProgram` represents one component of a distributed graph computation.
  VertexProgram.Builder |
  VertexProgram.Features |

- Class Summary
  Class | Description
  --- | ---
  Computer |
  GraphComputer.Exceptions |
  GraphFilter | GraphFilter is used by `GraphComputer` implementations to prune the source graph data being loaded into the OLAP system.
  KeyValue<K,V> |
  MapReduce.NullObject | A convenience singleton when a single key is needed so that all emitted values converge to the same combiner/reducer.
  Memory.Exceptions |
  MemoryComputeKey<A> | A `MemoryComputeKey` specifies what keys will be used by a `Memory` during a `GraphComputer` computation.
  MessageScope | A `MessageScope` represents the range of a message.
  MessageScope.Global | A Global message is directed at an arbitrary vertex in the graph.
  MessageScope.Local<M> | A Local message is directed to an adjacent (or "memory adjacent") vertex.
  MessageScope.Local.ReverseTraversalSupplier | A helper class that can be used to generate the reverse traversal of the traversal within a `MessageScope.Local`.
  VertexComputeKey | A `VertexComputeKey` specifies a property of a vertex that will be used to store `GraphComputer` data.

- Enum Summary
  Enum | Description
  --- | ---
  GraphComputer.Persist |
  GraphComputer.ResultGraph |
  GraphFilter.Legal | A enum denoting whether a particular result will be allowed or not.
  MapReduce.Stage | MapReduce is composed of three stages: map, combine, and reduce.
  ProgramPhase |

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